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Apr 2012

Volume 83, Issue 4, Articles (04xxxx)

Issue Cover Spotlight Figure

Rev. Sci. Instrum. 83, 041101 (2012); http://dx.doi.org/10.1063/1.3697599 (19 pages)

Michael A. Duncan

The laser vaporization cluster source in the "cutaway" configuration. The sample rod is mounted from above with a flexible nylon screw in a holding block. The pulsed gas valve is mounted in the stainless steel can (left) and the skimmer is mounted on the opposite wall.

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A resistive pyrolytic radical source for gas-surface reaction studies

David Y. Lee, Matthew M. Jobbins, and S. Alex Kandel

Rev. Sci. Instrum. 83, 044101 (2012); http://dx.doi.org/10.1063/1.3701370 (4 pages) | Cited 1 time

Online Publication Date: 5 April 2012

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We describe a thermal gas cracker designed to produce low fluxes of gas-phase radicals for use in radical-surface reaction studies. A resistively heated thin piece of highly oriented pyrolytic graphite is used as the pyrolysis filament, with the major advantage that this material remains inert at high temperatures. The instrument is built within an existing titanium sublimation pump, which simplifies construction and allows for self-pumping of the radical source. Thermal generation of Cl atoms from Cl2 was chosen to test the effectiveness of the instrument. 35Cl and 37Cl were generated with a concomitant decrease in parent 70Cl2 and 72Cl2 species, as monitored by a residual gas analyzer. The cracking fraction of Cl2 as a function of cell temperature is reported, with nearly full conversion achieved at high temperature.
Show PACS
82.30.Lp Decomposition reactions (pyrolysis, dissociation, and fragmentation)
82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
82.30.Cf Atom and radical reactions; chain reactions; molecule-molecule reactions
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